Winch lens baby should i buy

Hi, i want to buy lens baby but i don't know winch ones to buy, i saw the intro video here in the website but it stills hard to choose one model. by what i understood the control freak has the muse and composer features and the only different is the scout.is that right?
i am mainly buying for hdslr video shooting.

and the other thing i'm concerned is the optics and the other pieces , how they work and why i should i purchase them, winch features they give me. sorry if i'm being a dumb ass but i think the info here on the web site is not that clear...
thank you.